# This code is part of QSteed.
#
# (C) Copyright 2024 Beijing Academy of Quantum Information Sciences
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from typing import List, Union

from qsteed.passes.basepass import BasePass


class PassFlow:
    """A qsteed passflow describes a quantum circuit compilation process."""

    def __init__(self, passes: Union[List[BasePass], BasePass] = None) -> None:
        if passes is not None:
            if isinstance(passes, BasePass):
                passes = [passes]
            self.passes = list(passes)
        else:
            self.passes = []
